Combustion-engine piston.



A; BIE.

comausnow ENGINE PISTON. APPLICATION FILED FEB-2.1915.

1 ,226 ,631 Patented May 22, 1917.

'agn snr BIE, or wrnrnnrmin, SWITZER-LAND, ASSIGNQR T0 BUSCH-SULZER BROS. DIES-EL ENGINE COMPANY, or s'r. Louis, ivrr-ssounr, n'coaroaerron or MISSOURI.

COMBUSTION ENGINE ELSTON.

. manner,

Application filed February 2,1915. Serial No. 5,623.

To all whom it may concern v Be it known that I, ALBERT BIE, a citizen of the Kmgdom' of Norway, residmg in lVinterthur, Canton of Zurich, Switzerland,

have invented a new and useful linprove' ment in Combustion-Engine Pistons.

This invention is an improved watercooled piston for internal engines, the' object of which is to render the cooling space in the piston accessible for cleaning, to enable ,the cooling to be made more effective, and to permit replacement of the portion exposed to the combustion gases,

at the same time securing a construction.

is hollow for circulation of cooling water,

the .cooling space being included between a transverse wall -5 and a removable end plate 2, which latter, it will be understood, is at the end exposed to the combustion gases. The cooling space is preferably divided by an interior transverse wall 6 into spaces 3 and 8, the outer of which is closed ofi' from the combustion space by the plate 2. The said plate is suitably securedto the body, as by bolts 4, which are operated from the v crankside of the piston and draw the plate firmly against the rim 10 and also against one or more pro ections 7, which may extend from the wall 5 but preferably from the wall 6 as shown. These projections within the cooling space may naturally be varied in number and arrangement, their function bemg to support the pistonend plate against stresses interiorly of its circumference, thereby insuringgreat. solidity of construction and enabling a thinner plate to be employed with better cooling eifect and less expansion stresses or distortion than would otherwise be the case. At the same time the mounting of the plate is such-that it Is free to expand radially independently of the piston body whichis of advantage as the plate is likely to become the more highly I M heated of the two. In this connection it will combustion on the line A-A be noted that the plate is made of somewhat smaller diameter thanthe' body of the piston, Being a separate part, it may b made of special material, and its inner su face may be finished off smooth, thereby furtherincreasingthe: efficiency of the coolmg. It is readily replaced in event of wear, and when removed enables the cooling space to becl'eaned of deposits.

The two cooling spaces may be incommunication, through the openings 9 in wall through openings 11 and 12, or the two spaces-may recelve their coolmg wa'ter indepen dently if desired.

WVhat I claim as new isi '1. An internal combustion engine piston,

comprising a hollow body of cylinder diame-' ter containing a water-cooling space, and an end plate applied against the end of the body and closing said cooling space at the side adjacent the combustion space and means for detachably holding said plate in place. 1

' Specification of Letters Patent. Patented l [3y 22,.191i7/ 6, the space 3 being connected by known means .with supply and return connections 2. A water-cooled internal combustion engine piston, comprising a. hollow body of cylinder diameter open atfthe frontand having' one'or more projections within its cooling'space located inwardly of the peripheral wall, and a removable end plate securedto the body and bearing circumferentially against the peripheral wall of the same and inwardly of its circumference against said projections. v

3. -An internal combustion engine ,piston, comprising :a hollow body having a transyerse wall dividing the interior of the same 'into water-cooling spaces, the one nearest the combustion chamber being open and rovided with 1nter1or pro ections exten mg from said wall, and a removable end plate supported-against the periphery of the body and against said projections and closing off st id water-cooling space from the. combustion space g v 4. An internal combustion engine piston, comprising a hollow body of cylinder diameter containing a watebcooling space and open at the endadjacent the combustion.

space, and a removable plate secured against said end with freedom for independent radial expansion relative to the body.

5. An internal combustion engine piston, comprising a hollow body of cylinder diameter having a transverse wall dividin'gthe interior of the same in two water-cooling spaces each space having an independent inlet and outlet for the cooling Water, and a removable end plate closing 05 said watercooling spaces from the combustion space.

6. An internal combustion engine piston comprising a hollow body of cylinder diame-- c ter having a transverse Wall dividing the interior of the same in two water-cooling" 7. An internal combustion engine piston comprising a hollow body containing a water-coohng space, a removable end plate closlng said. cooling space at the side ad -a cent the combustion space, andlastening means adapted to draw the plate against the body and accessible at the back of the latter.

In testimony whereof, I have signed this specification inthe presence of two wit nesses v ALBERT BIE.

Witnesses: I

ROBERT SCHLAEFFER, C RL GUBLER. 

